Post on 27-Mar-2015
Math
GraphsGraphs
Graphs
Graphs are useful tools for organizing and showing information. People can collect data, or information, by taking surveys. Then they can create tally charts and graphs to help people visualize data, answer questions, and make predictions.
Tally Chart
Tally charts help people count. Each tally mark in a tally chart represents one object. For example, to count three smiley faces, you make three tally marks in the chart. Tally marks are grouped in sets of five, which makes counting easier. Instead of counting marks one-by-one, you can skip-count by fives and add on any remaining marks.
Color of Smiley Faces
Number of Balls
Tally Frequency
red / 1
orange /// 3
green //// 5
blue // 2
black 0
Length of Calls in Minutes
Number of Calls
Tally Frequency
3 / 1
4 /// 3
5 0
6 // 2
7 //// 5
8 //// // 7
9 //// 4
10 / 1
Tally Chart
Look at this tally chart.
How many 7 minute phone calls were made?
5 phone calls
How do you know?
There were 5 tally marks in the 7 minute row so the frequency was 5.
Line Plot
A line plot shows data on a number line with x or other marks to show frequency. This line plot shows the types of balls the children took outside to recess. The count of x marks above each category tells you the number of balls for each category.
X
X X
X X X
X X X X
Balls Taken Out For Recess
X
X
X X
X X X
X X X X
X X X X X
X X X X X X X
3 4 5 6 7 8 9 10
Number of Phone Calls
Length of Calls in Minutes
Look at this line plot. How many 10 minute phone calls took place?
1 phone call
Where does most of the data cluster? What does this tell you?
Most of the date clusters from 7 – 9 minutes. Most of the phone calls were 7 to 9 minutes long.
Where is the gap in the line plot? What does this tell you?
There is a gap at 5. No one made a phone call lasting 5 minutes.
X
X
X X
X X X
X X X X
X X X X X
X X X X X X X
3 4 5 6 7 8 9 10Length of Calls in Minutes
Number of Phone Calls
Pictograph
A pictograph is a graph drawn with pictures. Each piece of information collected is drawn as a picture. This pictograph shows what each child had for lunch today.
How many children ate hamburgers today at lunch?
6 studentsHow do you know?There are 3 hamburgers and each
hamburger represents 2 students.How many students ate pizza for lunch
today?9 studentsHow do you know?There are 4 and half pizzas and each
pizza represents two students.
What the students ate for lunch today
Legend
Each picture represents two students.
Study this pictograph. What is this pictograph showing?
Number of Books Read During Summer
Reader Number of Books
Kendra
Joel
Dan
Mae
Emily
Key: = 4 books
The number of books these kids read during the summer.
Tips on how to draw a pictograph:• A good pictograph shows the information clearly. • A good pictograph has a title. • A good pictograph has pictures showing
information. • A good pictograph has the pictures in a grid. • A good pictograph has pictures which are the
same size. • ALWAYS REMEMBER TO LABEL!
Now you get to make your own pictograph!!!
Draw your own Pictograph
Here is the information for your pictograph.
A 5th grade class was asked what they liked to do best during recess. Here is what they answered:
8 students said they liked to swing, 6 students said they liked to play on the teeter totter, 3 students liked to play on the slide, and 2 students liked to jump rope.
Now draw your pictograph. Remember your title and your legend!
What the 5th Grade Students Like to Play at Recess
Legend
Each picture represents two students.
How did you decide what each picture would represent?
Possible Answer:
I let each picture represent 2 books because 8, 6, and 2 are divisible by 2, and I could show 3 using a whole and half picture.
Bar Graph
Bar graphs are used to display data using a horizontal or vertical rectangular bar that levels off at the appropriate level. This bar graph shows what students in the 6th grade like to do best during the summer.
0
10
20
30
# o
f S
tud
en
ts
Swimming Riding Bikes Sports Vacations
Summer Activity
What the 6th Grade Likes to do in the Summer
Time Spent Riding a Bike
0
10
20
30
40
50
Min
ute
s
Sunday Monday Tuesday Wed Thursday Friday Saturday
Day
KenPat
How much time did Ken spend riding a bike on Sunday and Monday?
50 minutes
On what day did Pat ride his bike the longest?
Wednesday
Did Ken or Pat ride their bike less on Wednesday?
Ken
Draw your own Bar Graph
Here is the information for your bar graph.
Tony and Sherry both worked at Pizza Hut. Here are the hours they each worked last week.
Tony worked Sunday for 8 hours, Tuesday for 3 hours, Wednesday for 4 hours, and Friday for 6 hours. Sherry worked Monday for 4 hours, Tuesday for 4 hours, Wednesday for 3 hours, Friday for 5 hours, and Saturday for 6 hours.
Don’t forget a title for your graph. Remember to label!
Time Spent Working at Pizza Hut
0
1
2
3
4
5
6
7
8H
ou
rs
Sunday Monday Tuesday Wed Thursday Friday Saturday
Day
TonySherry
Histogram
Histograms are used to display data using a horizontal or vertical rectangular bar that levels off at the appropriate level. Histograms are very similar to bar graphs except that the bars are connected and show a block of time or measurement. This bar graph shows how long children stayed in the swimming pool on a hot afternoon.
How Long Children Staying in the Swimming Pool
02468
10121416
0-30 31-60 61-90 91-120 121-150
Time (in minutes)
# Of C
hildre
n
Distances Ridden on Trail
02468
101214161820222426
0-4 5-8 9-12 13-16 17-20
Distances (in miles)
Num
ber
Of C
yclis
ts
During which time period was the trail the most crowded? The least crowded?
7 P.M. – 10 P.M.; 1 P.M. – 4 P.M.
Can you tell how many cyclists were on the trail at 5:00 P.M.? Explain.
No; the histogram shows data for intervals of time, not individual times.
On another day, 3 more cyclists were on the trail at 8 A.M., 5 fewer were on at 2:00 P.M., and 10 more were on at 5:30 P.M. How would the histogram for this day be different?
The 7 A.M. – 10 A.M. bar would go up to 58;The 1 P.M. – 4 P.M. bar would go down to
20 and the 4 P.M. – 7 P.M. bar would go up to 70.
Draw your own Histogram
Here is the information for your histogram.
The local amusement park had visitors all day long on Saturday. From 10:00 – 12:00 100 visitors were at the park, from 12:00 – 2:00, 300 visitors were at the park, from 2:00 – 4:00 450 visitors were at the park, from 4:00 – 6:00, 350 visitors were at the park, and from 6:00 – 8:00, 200 visitors were at the park.
Don’t forget a title for your graph. Remember to label!
Visitors at the Amusement Park
0
100
200
300
400
500
10:00-12:00
12:00 -2:00
2:00 -4:00
4:00 -6:00
6:00 -8:00
Time (in hours)
Num
ber
Of V
isito
rs
Plotting Ordered Pairs
An 'ordered pair' is simply two numbers in a certain order. For example, the numbers '2' and '3' can form two ordered pairs:
2, 3 and 3, 2 When an ordered pair is used to locate a
point on a grid, the two numbers are called the 'coordinates' of the point. In this diagram, the point (2, 3) has been marked with a red dot. The coordinates of this point are '2' and '3'.
On a graph grid, the point (0,0) is called the 'origin' The first coordinate of a plotted point is called the 'x' coordinate (move over). The second coordinate of a plotted point is called the 'y' coordinate (move up). So, to locate the point: (2, 3) on our graph grid above, we start at the origin, move 2 units horizontally (over) and 3 units vertically (up).
F
B
D
0123456789
10
0 1 2 3 4 5
Coordinate Graphs & Ordered Pairs
What are the coordinates for these points?
B (1, 3)
D (4, 9)
F (2, 8)
FB
E
AC
D0123456789
10
0 1 2 3 4 5 6 7 8 9 1011
Use the coordinate grid to name each ordered pair.
1. A (7, 3)
2. B (1, 8)
3. C (4, 4)
4. D (3, 0)
5. E (6, 5)
6. F (2, 9)
Line Graph
Line Graphs can be used when you're plotting data that has peaks (ups) and valleys (downs), or that was collected in a short time period. This line graph shows how many children were in the 6th grade over the past 5 years.
Number of Students in the 6th Grade
0
5
10
15
20
25
30
2004 2005 2006 2007 2008 2009
Year
Num
ber
of S
tude
nts
Beth's Airplane Trips
012345678
1995 1996 1997 1998 1999 2000
Year
Nu
mb
er o
f T
rip
s
During how many years did Beth travel more than 4 times?
4 years
In which years did the number of trips increase?
1997 – 1998
In what year did Beth travel the least?
1995
Draw your own Line Graph
Here is the information for your line graph.
Last week, Brian’s school had snow days all week long. Here is how much snow fell each school day last week. On Monday 4 inches of snow fell, on Tuesday, 2 inches of snow fell, on Wednesday 4 inches of snow fell, on Thursday 6 more inches of snow fell, and on Friday 1 inch of snow fell.
Don’t forget a title for your graph. Remember to label!
Inches of Snow That Fell Last Week
01234567
Monday
Tuesday
Wed
nesday
Thursday
Friday
Day
Inch
es
Stem and Leaf Plot
A Stem and Leaf Plot is a method of organizing intervals or groups of data.
Here is an example:
Key: 3 | 6 = 36
A stem and leaf plot allows you to see easily the greatest, least, and median values in a set of data. It gives you a quick way of checking how many pieces of data fall in various ranges. It also lets you see the value of every piece of data.
How many students’ heights were measured?
19 students
How many students are taller than 56 inches?
10 students
What is the height of the tallest student?
63 inches
What is the mode of the students’ heights?
57 inches
What is the range of the students’ heights?
16 inches
What is the median student height?
57 inches
4 7 8 8 9 9
5 2 4 4 5 7 7 7 8 9 9
6 0 0 1 3
Key: 4 l 7 means 47 inches
Look at this Stem and Leaf Plot and
answer the questions.
Draw your own Stem and Leaf Plot
Here is the information for your Stem and Leaf Plot.
Yesterday, Tina’s teacher kept track of how many ounces of milk each student drank in one day. Here is the data she collected: 12, 20, 8, 32, 24, 32, 36, 21, 28, 32.
Don’t forget a title for your graph. Remember to label!
Milk Drunk in One Day
0 8
1 2
2 0 1 4 8
3 2 2 2 6
Key: 1 l 2 means 12 ounces
SURVEYS Population – group you want
information about Sample – a part of the population Representative – if the sample you
survey represents all the students Not representative – only a certain
group of the population is represented Random – every student has an equal
chance of being surveyed Not random – only certain students
have a chance of being surveyed.
At a band concert, survey 100 people to find out whether people in your town prefer vocal or instrumental music.
Population
A. People in your town
B. 100 concert-goers
C. Band members
Sample
A. 100 band members
B. People in your town
C. 100 concert-goers
Survey 10 band members to find out how long band members practice each day.
Population
A. 10 band members
B. All students in school
C. All band members
Sample
A. All band members
B. 10 band members
C. All students in school
Survey every 10th person in a phone directory to find out if adults in one city prefer concerts, plays, or movies.
Population
A. All adults with phones
B. All adults in one city
C. Every 10th person in phone directory
Sample
A. Every 10th adult in phone directory
B. All adults with phones
C. All adults in one city
During band practice, survey all drummers to find out if fifth graders prefer playing brass, woodwind, string, or percussion instruments.
Population
A. Drummers
B. Band members
C. Fifth graders
Sample
A. Band members
B. Fifth graders
C. drummers
In a school of 600 students, survey every 5th student entering the cafeteria to find out how many students have attended a concert.
Population
A. 600 students
B. 5 students
C. Every 5th student entering the cafeteria
Sample
A. 5 students
B. Every 5th student entering the cafeteria
C. 600 students
Good Graphing Websites
http://nces.ed.gov/nceskids/createagraph/ http://math-and-reading-help-for-kids.org/math
_games_for_kids_on_graphing.html http://www.lethsd.ab.ca/mmh/graphing/graph.
htm